The speed of light in vacuum is 299,792,458 meters (186,282 miles) per second.
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the measurement of energy mass speed of light
There is no "measurement of light". The units used depend on what you want to measure: its speed, frequency, wavelength, energy per photon, etc.
The speed of light is 299 792 458 m s-1.This is one of the very few exact physical constants; it is so by definition.This enables the meter to be determined by it and the second.
What do you mean by "exact measurement"? Do you wish to determine the cylinder's height? Its diameter? Its surface area? Its volume?
Is as exact as possible